import java.util.Scanner;

public class Training02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入直角三角形的底边长: ");
        double base = scanner.nextDouble();

        System.out.print("请输入直角三角形的高: ");
        double height = scanner.nextDouble();

        double area = calculateArea(base, height);
        System.out.println("三角形的面积是: " + area);

        scanner.close();
    }

    public static double calculateArea(double base, double height) {
        return 0.5 * base * height;
    }
}
